<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    a
    <hr color="red" width="50%">
    b
    <hr size="10px" color="green">
    c
    <hr align="right" color="blue" width="50%">
</body>
</html>